245/85R15 tire size in inches
A 245/85R15 tire measures
31.4" tall × 9.6" wide
8.20" sidewall on a 15" wheel. 642 revolutions per mile.
245/85R15 means a tire 245 mm wide, with sidewalls 85% as tall as the tire is wide (208 mm), radial construction (R), for a 15 inch wheel.
245/85R15 specs
| Overall diameter (height) | 31.40 inches (798 mm) |
|---|---|
| Section width | 9.65 inches (245 mm) |
| Sidewall height | 8.20 inches (208 mm) |
| Wheel (rim) diameter | 15 inches |
| Circumference | 98.6 inches (2,505 mm) |
| Revolutions per mile | 642 |
| Revolutions per kilometer | 399 |
| Approximate rim width | 6.5" to 8.0" |
| In inches (flotation style) | 31.4x9.6R15 |
| Aspect ratio | 85% |
Calculated from the size. Real tires differ by brand, model and tread depth, typically by a few tenths of an inch.
Sizes that can replace 245/85R15 on a 15" wheel
These 15" sizes are within 3% of 245/85R15's overall diameter, the range most tire shops treat as interchangeable.
| Size | Diameter | Width | Difference | Real speed at 60 | |
|---|---|---|---|---|---|
| 275/75R15 | 31.24" | 10.83" | −0.5% | 59.7 mph | Compare |
| 265/80R15 | 31.69" | 10.43" | +0.9% | 60.6 mph | Compare |
| 255/80R15 | 31.06" | 10.04" | −1.1% | 59.4 mph | Compare |
| 31x10.50R15 | 31.00" | 10.50" | −1.3% | 59.2 mph | Compare |
| 285/75R15 | 31.83" | 11.22" | +1.4% | 60.8 mph | Compare |
| 32x11.50R15 | 32.00" | 11.50" | +1.9% | 61.2 mph | Compare |
| 255/85R15 | 32.07" | 10.04" | +2.1% | 61.3 mph | Compare |
| 235/85R15 | 30.73" | 9.25" | −2.1% | 58.7 mph | Compare |
| 285/70R15 | 30.71" | 11.22" | −2.2% | 58.7 mph | Compare |
| 265/75R15 | 30.65" | 10.43" | −2.4% | 58.6 mph | Compare |
| 275/80R15 | 32.32" | 10.83" | +2.9% | 61.8 mph | Compare |
Same height on other wheel sizes (plus and minus sizing)
| Size | Wheel | Diameter | Difference | |
|---|---|---|---|---|
| 315/50R19 | 19" | 31.40" | 0.0% | Compare |
| 265/45R22 | 22" | 31.39" | 0.0% | Compare |
| 305/60R17 | 17" | 31.41" | 0.0% | Compare |
| 245/80R16 | 16" | 31.43" | +0.1% | Compare |
| 265/50R21 | 21" | 31.43" | +0.1% | Compare |
| 315/30R24 | 24" | 31.44" | +0.1% | Compare |
| 295/45R21 | 21" | 31.45" | +0.2% | Compare |
| 285/55R19 | 19" | 31.34" | −0.2% | Compare |
| 285/60R18 | 18" | 31.46" | +0.2% | Compare |
| 245/75R17 | 17" | 31.47" | +0.2% | Compare |
| 265/55R20 | 20" | 31.48" | +0.3% | Compare |
| 265/35R24 | 24" | 31.30" | −0.3% | Compare |
One size up or down
Compare 245/85R15 with another size
Questions
- How tall is a 245/85R15 tire?
- A 245/85R15 tire is 31.4 inches tall (798 mm), calculated from the size. It is 9.6 inches wide with 8.2 inches sidewalls. Real tires vary by a few tenths of an inch between brands and tread patterns.
- What does 245/85R15 mean?
- 245/85R15 means a tire 245 mm wide, with sidewalls 85% as tall as the tire is wide (208 mm), radial construction (R), for a 15 inch wheel.
- How many revolutions per mile does a 245/85R15 tire make?
- About 642 revolutions per mile, based on a circumference of 98.6 inches. Under load the tire flattens slightly, so the maker's published figure is usually a little higher.
- What rim width fits a 245/85R15 tire?
- Roughly 6.5" to 8.0". Check the tire maker's approved rim range for the exact model before buying wheels.
- Can I use 275/75R15 instead of 245/85R15?
- 275/75R15 is −0.16 inches (−0.5%) in overall diameter, so at an indicated 60 mph you would be doing 59.7 mph. Differences under 3% are usually fine, but check clearance, load index and your vehicle's placard.